Best Crockpot Ravioli Meatball Casserole

Ingredients:

24 ounces frozen ravioli
16 ounces frozen meatballs
4 cups tomato sauce
2 cups mozzarella cheese, shredded (or more)
2 tablespoons Italian seasoning or another dried herb
1 cup water (for Instant Pot only)
salt & pepper to taste

Instructions: